Jetson TX2/28 Display debug
Get prepared
This section focuses on debug display driver issue on rel-28.x release.
Drivers of tegra display controller are under kernel source: https://developer.nvidia.com/embedded/downloads
Location:
For T210(TX1)
kernel/display/drivers/video/tegra/dc/
For T186(TX2). Note that TX2 still uses driver code of T210.
kernel/t18x/drivers/video/tegra/dc
Tips
- Print current mode in dc
sudo cat /sys/kernel/debug/tegradc.X/mode #X=0,1,2.
- Print current mode in fbcon
sudo cat /sys/class/graphics/fb0/mode #if more than one fb, just change the fbX to whatever you want.
- Capture edid
sudo cat /sys/kernel/debug/tegradc.X/edid #X=0,1,2.
- Forcing edid
- Prepare a known 256byte EDID.
- set use_fallback = true; in tegra_edid_get_monspecs() under edid.c.
- fill in the known EDID to default_720p_edid[256].
Known issues
- HDMI
- Display is not be able to up. Moreover, system is not able to up.(Fix after rel-28.2)